Slope of -3 through the point of (2,1)

Question

help me find the slope of -3 through the points given 

Answer 1

The equation of a line is y = mx + b, where m is the slope and b is the y-intercept.  We are given m = -3.  Hence:

 

y = -3x + b

 

To find b, plug in the x and y values of the given point, (2,1):

 

1 = -3(2) + b

1 = -6 + b

7 = b

 

y = -3x + 7